APPENDIX B

The elastic constants of the models used in this paper to trace the rays for P waves are the following:

Layer 1 Layer 2 Layer 3 Layer 4

Figure 4 c₁₁= 9894

(center c₃₃= 9005

and c₄₄= 4949

right) c₁₃= 5655

Figure 5 c₁₁= 9005 c₁₁= 9894 c₁₁= 12545 c₁₁= 9005

c₃₃= 9005 c₃₃= 9005 c₃₃= 10845 c₃₃= 9005

c₄₄= 4949 c₄₄= 4949 c₄₄= 5968 c₄₄= 4949

c₁₃= 5655 c₁₃= 5655 c₁₃= 6805 c₁₃= 5655

In all cases, $\rho = 1$. $c_{ij}/\rho$ has units of velocity squared (ft/s)².